XML 58 R46.htm IDEA: XBRL DOCUMENT v3.25.1
Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other Investments [Roll Forward]    
Balance, beginning of period $ 539.0 $ 480.9
Purchases and commitments 8.1 46.8
Sales and distributions (24.8) (9.0)
Net realized and unrealized gains 4.0 4.2
Balance, end of period 526.3 522.9
Equity Securities Without Readily Determinable Fair Value [Roll Forward]    
Balance, beginning of period 50.4 50.4
Purchases and commitments 0.0 0.0
Sales and distributions 0.0 0.0
Net realized and unrealized gains 0.0 0.0
Balance, end of period 50.4 50.4
Fair Value Measured at NAV    
Other Investments [Roll Forward]    
Balance, beginning of period 488.6 430.5
Purchases and commitments 8.1 46.8
Sales and distributions (24.8) (9.0)
Net realized and unrealized gains 4.0 4.2
Balance, end of period $ 475.9 $ 472.5